dataString = "Substring removing"

# the first method
subString1 = dataString[0, 9]
# subString1 is "Substring"
puts "subString1 is #{subString1}"

subString1 = subString1[3, 6]
# subString1 is "string"
puts "subString1 is #{subString1}"

# the second method
subString2 = dataString.delete_suffix(' removing')
# subString2 is "Substring"
puts "subString2 is #{subString2}"

subString2 = subString2.delete_prefix('Sub')
# subString2 is "string"
puts "subString2 is #{subString2}"