diff --git a/praxis3/CMakeLists.txt b/praxis3/CMakeLists.txt
new file mode 100644
index 0000000..e69de29
diff --git a/praxis3/key_value_pair.c b/praxis3/key_value_pair.c
new file mode 100644
index 0000000..48d657f
--- /dev/null
+++ b/praxis3/key_value_pair.c
@@ -0,0 +1,135 @@
+#include "key_value_pair.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+key_value_pair *head = NULL;
+key_value_pair *tail = NULL;
+
+char *key_value_pair_to_string(key_value_pair *kv)
+{
+    char *str = malloc(sizeof(char) * (strlen(kv->key) + strlen(kv->value) + 1));
+    if (str == NULL) return NULL;
+
+    strcpy(str, kv->key);
+    strcat(str, kv->value);
+
+    return str;
+}
+
+// initializes a new instance of key_value_pair with given values on given pointer
+key_value_pair *init_key_value_pair(const char *key, const char *value)
+{
+    key_value_pair *kv = (key_value_pair*)malloc(sizeof(key_value_pair));
+    if (kv == NULL)
+    {
+        perror("Failed to allocate memory for key_value_pair");
+        return NULL;
+    }
+    kv->key = strdup(key);
+    if (kv->key == NULL)
+    {
+        free(kv);
+        perror("Failed to allocate memory for key_value_pair->key");
+        return NULL;
+    }
+    kv->value = strdup(value);
+    if (kv->value == NULL)
+    {
+        free(kv->key);
+        free(kv);
+        perror("Failed to allocate memory for key_value_pair->value");
+        return NULL;
+    }
+
+    kv->next = NULL;
+    kv->toString = key_value_pair_to_string;
+
+    return kv;
+}
+
+// frees the given instance of struct key_value_pair
+void free_key_value_pair(key_value_pair **kv)
+{
+    if (*kv == NULL) return;
+
+    free((*kv)->key);
+    free((*kv)->value);
+    free(*kv);
+
+    *kv = NULL;
+}
+
+// frees whole key_value_pair list structure
+void free_key_value_pairs()
+{
+    while (head != NULL)
+    {
+        key_value_pair *toFree = head;
+        head = head->next;
+        free_key_value_pair(&toFree);
+    }
+    tail = NULL;
+}
+
+
+// adds given key_value_pair to list
+int add_key_value_pair(key_value_pair *kv)
+{
+    if (head == NULL)
+    {
+        head = kv;
+        tail = kv;
+    }
+    else
+    {
+        key_value_pair *iterator = head;
+        while (iterator->next != NULL)
+        {
+            if (strcmp(kv->key, iterator->key) == 0)
+            {
+                char *bak = iterator->value;
+                iterator->value = (char*)realloc(iterator->value, strlen(iterator->value) + strlen(kv->value) + 1);
+                if (iterator->value == NULL)
+                {
+                    iterator->value = bak;
+                    return -1;
+                }
+                strcat(iterator->value, kv->value);
+                return 0;
+            }
+            iterator = iterator->next;
+        }
+        iterator->next = kv;
+        tail = kv;
+    }
+    return 0;
+}
+
+// removes given key_value_pair from list
+void remove_key_value_pair(key_value_pair *kv)
+{
+    if (head == NULL || kv == NULL) return;
+    if (head == kv)
+    {
+        head = head->next;
+        if (tail == kv) tail = NULL;
+        return;
+    }
+
+    key_value_pair *iterator = head;
+    if (iterator == NULL) return;
+
+    while (iterator != NULL)
+    {
+        if (iterator->next == kv)
+        {
+            iterator->next = kv->next;
+            if (tail == kv) tail = iterator;
+            return;
+        }
+        iterator = iterator->next;
+    }
+}
+
diff --git a/praxis3/key_value_pair.h b/praxis3/key_value_pair.h
new file mode 100644
index 0000000..d9c010e
--- /dev/null
+++ b/praxis3/key_value_pair.h
@@ -0,0 +1,20 @@
+#ifndef MAP_REDUCE_H
+#define MAP_REDUCE_H
+
+// Constants
+
+typedef struct key_value_pair{
+  char *key;
+  char value;
+  struct key_value_pair *next;
+} key_value_pair;
+
+static key_value_pair *head = NULL;
+
+// Functions
+void init_key_value_pair(key_value_pair *kv, char *key, char *value);
+void free_key_value_pair(key_value_pair *kv);
+
+void add_key_value_pair(key_value_pair *kv, char *key, char *value);
+
+#endif //MAP_REDUCE_H
diff --git a/praxis3/zmq_distributor.c b/praxis3/zmq_distributor.c
new file mode 100644
index 0000000..2c072e7
--- /dev/null
+++ b/praxis3/zmq_distributor.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main() {
+  printf("Hello, World!\n");
+}
+
diff --git a/praxis3/zmq_worker.c b/praxis3/zmq_worker.c
new file mode 100644
index 0000000..7560393
--- /dev/null
+++ b/praxis3/zmq_worker.c
@@ -0,0 +1 @@
+#include "worker.h"