String Manipulator - Group 2

function solve(input) {
   let text = input.shift();

   const change = (char, replacement) => {
      let pattern = new RegExp(char, "g");
      text = text.replace(pattern, replacement);
      console.log(text);
   };

   const includes = (string) => {
      text.includes(string)
         ? console.log('True')
         : console.log('False');
   };

   const end = (string) => {
      let length = string.length;
      let endOfString = text.substring(text.length - length);
      endOfString === string
         ? console.log('True')
         : console.log('False');
   };

   const uppercase = () => {
      text = text.toUpperCase();
      console.log(text);
   };

   const findIndex = (char) => {
      let index = text.indexOf(char);
      console.log(index);
   };

   const cut = (startIndex, length) => {
      let cutText = text.substr(startIndex, length);
      console.log(cutText);
   }


   for (let line of input) {
      if (line === 'Done') {
         break;
      }
      let tokens = line.split(' ');
      let command = tokens.shift();
      if (command === 'Change') {
         let char = tokens[0];
         let replacement = tokens[1];
         change(char, replacement);
      } else if (command === 'Includes') {
         let string = tokens[0];
         includes(string);
      } else if (command === 'End') {
         let string = tokens[0];
         end(string);
      } else if (command === 'Uppercase') {
         uppercase();
      } else if (command === 'FindIndex') {
         let char = tokens[0];
         findIndex(char);
      } else if (command === 'Cut') {
         let startIndex = tokens[0];
         let length = tokens[1];
         cut(startIndex, length);
      }

   }
}