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Returns a copy of +self+ with leading substring +prefix+ removed:

  'oof'.delete_prefix('o')          # => "of"
  'oof'.delete_prefix('oo')         # => "f"
  'oof'.delete_prefix('oof')        # => ""
  'oof'.delete_prefix('x')          # => "oof"
  'こんにちは'.delete_prefix('こん')  # => "にちは"

Related: see {Converting to New String}[rdoc-ref:String@Converting+to+New+String].