Add some comments

TTH.c

@@ -5,6 +5,8 @@
 char block[4][4];
 int total[4];
 
+// Adds the letters's values to the running total
+// and uses modulus on the total
 void add_blk(char blk[4][4]) {
 	for (int i = 0; i < 4; ++i)
 	{
@@ -16,6 +18,7 @@ void add_blk(char blk[4][4]) {
 	}
 }
 
+// Reorders the letters in the given block according to description.
 void reorder_blk(char blk[4][4]) {
 	char tmp;
 	for (int i = 0; i < 3; ++i)
@@ -45,6 +48,9 @@ void proc_blk(char blk[4][4]) {
 }
 
 int ind = 0;
+// Goes through the given string and gets only a-z and A-Z
+// from the string. Stores the last position it was at in
+// 'ind' for finding the next block easier.
 void get_next_block(char const *text) {
 	int len = 0;
 	while (len < 16) {