Why this code not working? #Strip Comments / 4kyu

[obaid-ba]

function solution ( input, markers, arr = [], i=0 ) {
  input = input.split( "\n" );
  while ( input.length !== 0 ) {
    if ( input[i].indexOf( markers[0] ) !== -1 ) {
      arr.push( input[i].substring( 0, input[i].indexOf( markers[0] ) )
      input.splice( i, 1 )
    } else if ( input[i].indexOf( markers[1] ) !== -1 ) {
      arr.push( input[i].substring( 0, input[i].indexOf( markers[1] ) ) )
      input.splice( i, 1 )
    } else if ( input[i].indexOf( markers[1] ) === -1 && input[i].indexOf( markers[0] ) === -1 ) {
      arr.push( input[i] )
      input.splice( i, 1 )
    }
  }
  return arr.join("\n").trim()
};