Triangle - Recursion

#include <iostream>

using namespace std;

void mLine (char ch1, char ch2);
void Triangle(char ch1, char ch2) {
   // Last line should have no spaces in it
   static int spaceCounter = 0;
   if (ch1 < ch2) {
      // The previous line should have one extra space
      spaceCounter ++;
      Triangle(ch1, ch2 - 1);
   }
   // Display our spaces
   mLine(' ', spaceCounter);
   // Display our letters
   mLine(ch1, ch2);
   spaceCounter --;
   cout << "\n";
}

void mLine(char ch1, char ch2) {
   // Handle our space recursion
   if(ch1 == ' ') {
      // If we still have spaces left
      if(ch2 != 0) {
         cout << ch1;
         mLine(ch1, ch2 - 1);
      }
   }
   else if(ch1 <= ch2) {
      cout << ch1;
      mLine(ch1 + 1, ch2);
      if(ch1 < ch2)
         cout << ch1;
   }
}

int main() {
   Triangle ('a', 'm');
   return 0;
}