If the current character of the first string is not an alphanumeric character , increase the pointer i
while ( i < len1 and ( ( ( str1 [ i ] >= ' a ' and str1 [ i ] <= ' z ' ) or ( str1 [ i ] >= ' A ' and str1 [ i ] <= ' Z ' ) or ( str1 [ i ] >= '0' and str1 [ i ] <= '9' ) ) == False ) ) : NEW_LINE INDENT i += 1 NEW_LINE DEDENT