added function to determine binary string length

src/conversionOfNumbers/conversionOfNumbers.c

@@ -1,5 +1,19 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
+
+#include "conversionOfNumbers.h"
+
+int binaryStrLen(int input){
+    int length;
+        for(int x = 0; x < input; x++){
+            if(pow(2,x) >= input + 1){
+                length = x;
+                break;
+                }
+        }
+        return length;
+}
 
 char* convertIntToBinaryStr(int input){
     if(input > 3 || input < 0) return NULL;