made work: line numbers in files with the correct indentation level (tested on a > 1000 lines file)

include/file.h

@@ -32,4 +32,6 @@ int fileExists(file_t* f);						// 1 = yes, 0 = no
 
 void fileCreateEmpty(char* path);				// create an empty file with the given name
 
+void fileNumberLines(file_t* f);				// prepend line numbers in front of each line in a file
+
 #endif

include/util.h

@@ -0,0 +1,10 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+char* intToString(int x);                       // convert an int into a string
+
+long pow(int x, int n);                         // x^n
+
+int maxLowerPowerOf10(int x);                   // biggest power of 10 that is < x
+
+#endif