str_cmpl: Complement character.
In Hide-Fun/metabarcode: matabar; tools for metabarcoding

Complement character.

str_cmpl(
  .id,
  .gather = 4,
  .fill = "0",
  .prefix = NULL,
  .suffix = NULL,
  .sep = ""
)

`.id`	character
`.gather`	max num
`.fill`	filling character.
`.prefix`	prefix
`.suffix`	suffix
`.sep`	separator.

str_cmpl(.id = 2)
str_cmpl(.id = "Apple", .gather = 10, .fill = "A")
str_cmpl(.id = 34, .gather = 4, .fill = "9")
str_cmpl(.id = 12, .gather = 4, .fill = "0",
         .prefix = "suetsugulab", .sep = "-")
str_cmpl(.id = 12, .gather = 4, .fill = "0",
         .prefix = "suetsugulab-", .suffix = "A")