M0003 no such field or method

example $ marmot build .
error[M0003]: b.WriteStrin undefined (type strings.Builder has no field or method
              WriteStrin)
 --> ./main.go:9:4
  |
9 |     b.WriteStrin("x")
  |       ^^^^^^^^^^ `strings.Builder` has no field or method `WriteStrin`
  |
  = note: methods of `strings.Builder`: `(*Builder) Cap`, `(*Builder) Grow`,
          `(*Builder) Len`, `(*Builder) Reset`, `(*Builder) String`,
          `(*Builder) Write`, `(*Builder) WriteByte`, `(*Builder) WriteRune`,
          `(*Builder) WriteString`
help: use `WriteString` (check it)
  |
9 -     b.WriteStrin("x")
9 +     b.WriteString("x")
  |

error: build failed with 1 error
for more about an error, run `marmot explain M0003`

package main

import (
	"strings"
)

func main() {
	var b strings.Builder
	b.WriteStrin("x")
}