11: Add solutions for section "strings".

Dependencies

• [2] H6XH45OP 0

Change contents

• edit in exercises/strings/strings2.rs at line 4
  [2.96414]→[2.96414:96432](∅→∅)
  −

  − // I AM NOT DONE
• replacement in exercises/strings/strings2.rs at line 7
  [2.96516]→[2.96516:96547](∅→∅)
  − if is_a_color_word(word) {
  [2.96516]

  [2.96547]
  + if is_a_color_word(&word) {
• edit in exercises/strings/strings1.rs at line 4
  [2.96946]→[2.96946:96964](∅→∅)
  −

  − // I AM NOT DONE
• replacement in exercises/strings/strings1.rs at line 11
  [2.97120]→[2.97120:97131](∅→∅)
  − "blue"
  [2.97120]

  [2.97131]
  + String::from("blue")